[opismahname]

Woow, this is much harder then i excpected.

local frame = CreateFrame("FRAME", "RFFrame");
frame:RegisterEvent("UNIT_AURA");
local function eventHandler(self, event, ...)
end
local active = UnitBuff('player', 'Righteous Fury')
local hasrf
local function eventHandler(self, event, ...)
if not hasrf and active then
    hasrf = true
    print('Rigtheous Fury has been activated')
elseif hasrf and not active then
    hasrf = false
end
frame:SetScript("OnEvent", eventHandler);

Is this right? (I guess not, but tried to do what you wrote)